JPH098764A - Signal multiplex/demultiplex system, signal multiplexer and demultiplexer - Google Patents

Abstract

PURPOSE: To efficiently multiplex and transmit plural input signals with simple configuration without providing any transmission line of large capacitance in proportion to the number of input signals. CONSTITUTION: A call origination/disconnection monitor circuit 12, which detects the call originate signal of an audio data CH1 of 16kbit/s, applies the control signal of multiplexing to a multiplexer/demultiplexer circuit 11 and declares accommodation by setting the bits of non-used slots SIG 1 and 2 of a frame. This declaration is transmitted from the multiplexer/demultiplexer circuit 11 to a multiplex transformer 2 on the reception side by bit data accommodated in a slot C. At the same time, the audio data of 16kbit/s are accommodated in non-used slots V1 and V2. When the call origination/disconnection monitor circuit 12 detects the call originate signal of a terminal data CH3 of 9.6kbit/s, the control signal of multiplexing is applied to the multiplezer/demultiplexer circuit 11 and accommodation is declared by setting the bits of non-used slots S4-S6 of the frame.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a signal multiplexer / demultiplexer, a signal multiplexer and a signal multiplexer / demultiplexer, which can be applied to multiplex transmission of a plurality of input data such as voice data and terminal data. .

[0002]

2. Description of the Related Art In recent years, transmission systems for multiplexing and transmitting voice signals and terminal data have been actively developed. Specifically, the transmitter side multiplexes encoded data obtained by compression-encoding an audio signal and terminal data, and outputs the multiplexed data to the transmission path.
Basically, the receiving side demultiplexes the multiplexed data from the transmission path, decodes it to obtain a voice signal, and demultiplexes and outputs terminal data as well.

[0003]

Even when voice coded data, terminal data, etc. are multiplexed, in practice,
It is desired that a plurality of telephones or a plurality of terminal devices be connected to the multiplexing device so that they can be multiplexed.

However, the transmission capacity of the transmission line is generally constant, and in the conventional TDM, the number accommodated is almost determined by the signal capacity. In addition, a plurality of voice coded data (for example, 38 kbit / s, 16 kb, which have different information amounts) are provided on the transmission path.
it / s, 32 kbit / s, etc.) and a plurality of terminal data (for example, 2.4 kbit / s, 4.8 kbit / s).
In order to transmit s, 9.6 kbit / s, 19.2 kbit / s, etc. in a mixed manner, it is sufficiently practical if multiplexing and demultiplexing cannot be efficiently performed by a multiplexing method that has not been available in the past. It is not possible to realize a system with a simple configuration for use in.

From the above, it is possible to efficiently multiplex and transmit a plurality of input signals with a simple structure without the need for providing a large capacity transmission line in proportion to the number of input signals. It is required to provide a demultiplexing system, a signal multiplexer and a signal demultiplexer.

[0006]

Therefore, according to the present invention, input signals from a plurality of devices are accommodated in a frame and multiplexed,
In a signal multiplexing / separating system including a signal multiplexer for forming a signal multiplexing frame and a signal multiplexer / demultiplexer for receiving and demultiplexing a signal multiplexing frame from the signal multiplexer, the following characteristic configuration is provided. This is to solve the above problems.

That is, according to the present invention, in a signal multiplexing device, a call request detecting means for detecting a call request signal from the plurality of devices, a multiple busy area and a multiple unused area in the signal multiplex frame. And a signal multiplex frame managing means for generating information indicating the state of the signal multiplex arrangement in the signal multiplex frame, the call request detecting means, and the signal multiplex frame managing means. By using the and, the input signal from the device that has issued the call request signal is accommodated in any of the multiplexed unused areas in the signal multiplexing frame, and generated by the signal accommodation arrangement information generating means. Multiplexing means for accommodating and accommodating the signal accommodating arrangement information to form and output the signal multiplex frame.

Further, according to the present invention, a signal demultiplexing apparatus extracts signal accommodation arrangement information from the signal multiplexing frame, and demultiplexes a signal accommodated in the signal multiplexing frame from the extracted signal accommodation arrangement information. This is a configuration including a separating means.

[0009]

According to the above-described structure of the present invention, when the input signals from a plurality of devices are accommodated in a signal multiplex frame and multiplexed, a call request signal from the above devices is detected and this is detected. The input signal from the terminal which issued the call request signal is accommodated in the signal multiplex frame. Moreover, the state of the signal accommodating arrangement of the signal multiplex frame is managed, and the input signal from the device in which the call request signal is detected is accommodated in any unused accommodating area. At this time, for example, when the unused accommodating area cannot be accommodated due to the signal capacity (transmission capacity) of the input signal, the call request is rejected. Furthermore, when the input signal can be accommodated in an unused accommodating area, the input signal is accommodated, and information indicating the state of the signal accommodation arrangement in the signal multiplex frame is generated. It is stored in a predetermined place, given to a demultiplexer, and transmitted for demultiplexing a plurality of signals.

The signal demultiplexing device extracts the signal accommodation arrangement information in the signal multiplexing frame received from the signal multiplexing device, and recognizes where and in which signal the signal is accommodated from which device in the signal multiplexing frame. , The signal of each device is separated and output by this recognition. Therefore, even if the signals from the devices are not fixedly determined and, for example, the signals of the devices A1 to An are arranged and accommodated discontinuously, the arrangement order can be recognized from the signal accommodation arrangement information.

Therefore, the conventional mere time division multiplexing system can be used without providing a transmission line having a large transmission capacity in proportion to the number of input signals accommodating the transmission line between the signal multiplexer and the signal demultiplexer. It is possible to easily accommodate and multiplex the input signals of a relatively large number of devices with a relatively small transmission line capacity as compared with (TDM).

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a block diagram of a multimedia multiplex transmission system of this embodiment. In FIG. 1, the multimedia multiplex transmission system is mainly composed of a transmitting side multimedia multiplex converting apparatus 1 and a receiving side multimedia multiplex converting apparatus 2. Further, the transmitting side multimedia multiplexing / conversion apparatus 1 and the receiving side multimedia multiplexing / conversion apparatus 2 are connected so that they can communicate with each other via a high-speed digital dedicated line of 64 kbit / s.

Further, the multimedia multiplexer / demultiplexer 1 on the transmission side specifically includes a multiplexer / demultiplexer circuit 11, a call origination / disconnection monitoring circuit 12, a line termination circuit 13, and input / output interface circuits 14-18. It consists of Further, the multimedia multiplexer / decoder 2 on the receiving side also includes the multiplexer / demultiplexer circuit 21, the call origination / disconnection monitoring circuit 22, and the line termination circuit 2
3 and input / output interface circuits 24 to 28.

The input / output interface circuit 14 of the transmitting side multimedia multiplexing / conversion apparatus 1 is a 1
Audio data (CH1) of 6 kbit / s is taken in and given to the multiplexing / separating circuit 11 and the calling / disconnection monitoring circuit 12, and 16 kbit / s from the multiplexing / demultiplexing circuit 11.
The voice data of is captured and output to a telephone or the like. Further, the input / output interface circuit 15 takes in 32 kbit / s voice data (CH2) from another telephone or the like, and multiplex / separate circuit 11 and calling / disconnection monitoring circuit 12
And 32 kbi from the demultiplexing / demultiplexing circuit 11
It takes in t / s voice data and outputs it to a telephone or the like.

The input / output interface circuit 16 receives the signal from the terminal device (for example, personal computer).
The terminal data (CH3) of 6 kbit / s is fetched and given to the multiplexing / demultiplexing circuit 11 and the calling / disconnection monitoring circuit 12, and 9.6 kbit / s from the multiplexing / demultiplexing circuit 11
The terminal data of s is taken in and output to the terminal device. The input / output interface circuit 17 receives 9.6 from another terminal device.
The terminal data (CH4) of kbit / s is taken in and given to the multiplexing / separating circuit 11 and the calling / disconnection monitoring circuit 12,
Also, the terminal data of 9.6 kbit / s from the multiplexing / demultiplexing circuit 11 is fetched and output to the terminal device.

The input / output interface circuit 18 takes in terminal data of 19.2 kbit / s from another terminal device and supplies it to the demultiplexing / demultiplexing circuit 11 and the calling / disconnection monitoring circuit 12, and also the demultiplexing / demultiplexing circuit. 19.2 kb from 11
It captures the terminal data of it / s and outputs it to the terminal device.

The calling / disconnection monitoring circuit 12 detects a calling signal, a disconnection signal or the like from the data given from the input / output interface circuits 14 to 18, and sends a multiplexing / separation control signal to the multiplexing / separation circuit 11. give. The multiplexing / demultiplexing circuit 11 efficiently multiplexes the voice data and the terminal data from the input / output interface circuits 14 to 18, obtains the multiplexed data at the transmission rate of 64 kbit / s, and gives it to the line terminating circuit 13. The line terminating circuit 13 terminates the high-speed digital leased line, outputs multiplexed data of 64 kbit / s to the high-speed digital leased line, takes in the multiplexed data from the high-speed digital leased line, and multiplex / demultiplex circuit 1
Give to 1.

The line terminating circuit 23 of the multimedia multi-converter 2 on the receiving side terminates the high-speed digital leased line,
The multiplexed data from the high-speed digital leased line is given to the multiplexer / demultiplexer circuit 21, and
Outputs 4 kbit / s multiplexed data to a high-speed digital dedicated line. The multiplexer / demultiplexer circuit 21 includes a line termination circuit 23.
Received 64kbit / s multiplexed data from
Under the control of the disconnection monitoring circuit 22, the input / output interface circuits 24 to 28 are demultiplexed and voice data or terminal data is supplied to the input / output interface circuits 2 to 28.
The voice data and the terminal data from 4 to 28 are multiplexed under the control of the calling / disconnection monitoring circuit 22 and given to the line terminating circuit 23.

The input / output interface circuits 24 to 28 output the voice data and the terminal data from the multiplexing / demultiplexing circuit 21 to the telephone and the terminal device, and call the voice data and the terminal data from the telephone and the terminal device. It is given to the disconnection monitoring circuit 22 and the multiplexing / demultiplexing circuit 21.

Specifically, the input / output interface circuit 2
4 is voice data (CH1) from the multiplexing / demultiplexing circuit 21.
Is output to the telephone at 16 kbit / s, and 16 kbit / s voice data of the telephone is given to the calling / disconnection monitoring circuit 22 and the multiplexing / demultiplexing circuit 21. The input / output interface circuit 25 outputs the voice data (CH2) from the multiplexing / demultiplexing circuit 21 to the telephone at 32 kbit / s, and outputs the voice data of 32 kbit / s of the telephone to the calling / disconnection monitoring circuit 22 and the multiplexing / disconnection monitoring circuit 22. And the separation circuit 21.

The input / output interface circuit 26 is a multiplex interface.
The terminal data (CH3) from the separation circuit 21 is 9.6 kb.
It / s is output to the terminal device, and at the same time, 9.
Call / disconnection monitoring circuit 22 for 6 kbit / s terminal data
And the demultiplexing / demultiplexing circuit 21. The input / output interface circuit 27 outputs the terminal data (CH4) from the multiplexing / demultiplexing circuit 21 to the terminal device at 9.6 kbit / s, and calls / disconnects the terminal data of 9.6 kbit / s from the terminal device. It is applied to the monitoring circuit 22 and the multiplexing / demultiplexing circuit 21.

The input / output interface circuit 28 is a multiplex interface.
Terminal data (CH5) from the separation circuit 21 is 19.2k
In addition to outputting to the terminal device at bit / s, the terminal data of 19.2 kbit / s from the terminal device is given to the calling / disconnection monitoring circuit 22 and the multiplexing / demultiplexing circuit 21. The calling / disconnection monitoring circuit 22 includes input / output interface circuits 24-2.
A calling signal, a disconnection signal, etc. are detected from the data given from 8 and a multiplexing / demultiplexing control signal is given to the multiplexing / demultiplexing circuit 21.

(Call / Disconnection Monitoring): Next, the call / disconnection monitoring characteristic of the present invention will be described. Calling
The disconnection monitoring circuit 12 includes an input / output interface circuit 14,
Signaling information is monitored from the voice data from 15. This signaling information is the signaling send S
S signal or signaling receive SR signal. The calling / disconnection monitoring circuit 12 also monitors the state of the control line from the terminal data from the input / output interface circuits 16, 17, and 18. The state of the control line means the transmission request signal R
S, the state of the carrier detection signal CD.

If the signaling send SS signal is on or the transmission request signal RS is on, the calling / disconnection monitoring circuit 12 recognizes the calling state, and the signaling send SS signal.
If the signal / signaling receive SR signal is turned off or the transmission request signal RS / carrier detection signal CD is turned off, it is used as a trigger for disconnecting communication. Further, when the calling state is recognized, the channel C to which the data of the calling channel CH is to be multiplexed or to be disconnected is to be multiplexed.
Generates a control signal for cutting H data and
It is given to the separation circuit 11.

The above-described mechanism of the calling / disconnection monitoring circuit 12 is the same for the calling / disconnection monitoring circuit 22 on the receiving side.

(Multiplexing operation): FIG. 2 is an explanatory diagram of a multiplexing method in the multiplexing / demultiplexing circuit 11. In FIG. 2, the multiplexed frame (5 msec) is formed by stacking four small frames (1.25 msec).
The small frame is composed of 8 columns (8 bits) × 10 rows (10 bits).

The first line of the small frame in FIG. 2B is shown in FIG.
As shown in (c), in the first small frame F1, the frame synchronization bit data F is arranged in the first column, and the other second
In columns 8 to 8, 0 or 1 is arranged as an empty bit.
In addition, in the first row of the second small frame F2, the first column is arranged as empty bits, and the second to eighth columns use control signals (RS / C) that are used simultaneously when transmitting terminal data.
D) terminal data transmission control signals S4, S7, S10,
S13, S16, S19 and S22 are arranged.

In the first row of the third small frame F3, the first
The columns are arranged as empty bits, and control signals (RS that are used at the same time when transmitting terminal data are transmitted to the second to eighth columns).
/ CD) terminal data transmission control signals S5, S8, S1
1, S14, S17, S20, S23 are arranged. 4th
In the first row of the small frame F4, the first column is arranged as empty bits, and the second to eighth columns are the terminal data of the control signal (RS / CD) used at the same time when transmitting the terminal data. Transmission control signals S6, S9, S12, S15, S1
8, S21 and S24 are arranged.

In the second to eighth rows of the first column of the small frame of FIG. 2B, the signaling signal SS / SR for the transmission of the audio data, the signaling signal for the transmission of the audio data for the transmission of the audio signal SS / SR are transmitted. SIG7 to SIG2 are arranged. Further, in the 9th and 10th rows of the first column, the voice data and the terminal data are assigned to an empty line (empty slot) at the time of calling, and which idle line is allocated and transmitted. A communication signal C for notifying the receiving side is arranged. Specifically, if the empty line (empty slot) is voice data, as shown in FIG. 2B, the first to tenth rows of the eighth to second columns of the voice data V1 to V7.
It is the line. Each of V1 to V7 in each column is a slot that accommodates audio data at 8 kbit / s. Therefore,
If all the slots V1 to V7 are occupied and accommodated, 8
It is possible to accommodate audio data of kbit / s × 7 = 56 kbit / s.

Further, the terminal data includes terminal data accommodating slots BLK4 to BLK in the second to eighth columns of the second to tenth rows.
It is housed in LK24. Here, the terminal data accommodating slots BLK4 to BLK24 are each configured in units of 3 bits, and the 3-bit terminal data accommodating slot BLK accommodates 2.4 kbit / s. Therefore, 2.4 kit / s × in the terminal data accommodating slots BLK4 to BLK24
21 slots = 50.4 kbit / s of terminal data can be accommodated.

Further, voice data accommodating slots V1 to V7
And the terminal data accommodating slots BLK4 to BLK24 overlap, it is necessary to accommodate them so that they do not overlap. Therefore, it is accommodated and multiplexed while automatically assigning which data is accommodated. Specifically, when accommodating the audio data in the slots V1 to V7, the slots SIG1 to SI in the eighth row to the second row of the first column are stored.
The bit of G7 is set (assigned). When the terminal data is stored in the slots BLK1 to BLK24, the slot S in the second to eighth columns in the first row is used.
The bits of (in detail, S4 to S24) are set.

(Detailed Example of Multiplexing): Next, a detailed example of multiplexing will be described with a specific example. Therefore, FIG.
[Fig. 6] is an explanatory diagram in the case of specifically multiplexing by calling data of CH1, 3, and 4. The following description will be given with reference to FIG. First, 16 kbit / s audio data CH1
The calling / disconnection monitoring circuit 12 which has detected the calling signal (SS / SR ON signal) of the frame supplies a multiplexing control signal to the multiplexing / demultiplexing circuit 11 so that the unused frame, for example, the slot SIG1. Set a bit of 2 to declare containment. This declaration is transmitted from the multiplexing / demultiplexing circuit 11 to the receiving side multimedia multiplexing / conversion apparatus 2 according to the bit data accommodated in the slot C. 16kbit / at the same time
The voice data of s is stored in the unused slot V1 (1 in the 8th column).
Lines 10 to 10) (8 kbit / s) and slot V2
(1st row to 10th row in the 7th column).

Furthermore, terminal data C of 9.6 kbit / s
When the calling / disconnection monitoring circuit 12 detects the H3 calling signal, a multiplexing control signal is given to the multiplexing / demultiplexing circuit 11 so that unused frames, for example, slots S4 to S
Six bits are set to declare containment. This declaration is also transmitted from the multiplexing / demultiplexing circuit 11 to the receiving side multimedia multiplexing / conversion apparatus 2 by the bit data accommodated in the slot C. At the same time CH3 9.6 kbit / s
The terminal data of the frame is an unused slot BLK4 of the frame.
It is housed in ~ 7. That is, each of the BLKs 4 to 7 stores 2.4 kbit / s, and a total of 9.6 kbit / s is stored.

Furthermore, when the calling / disconnection monitoring circuit 12 detects a calling signal of the terminal data CH4 of 9.6 kbit / s, a multiplexing control signal is given to the multiplexing / demultiplexing circuit 11 to send a frame. Unused, for example, slot S8-
The bit of S11 is set to declare the accommodation. This declaration also depends on the bit data stored in slot C,
It is transmitted from the multiplexing / demultiplexing circuit 11 to the multimedia multiplexing conversion apparatus 2 on the receiving side. At the same time CH4 9.6kbit
The terminal data of / s is an unused slot BL of the frame.
It is accommodated in K8 to BLK11.

As described above, the channels CH1 and CH
The multiplexed frame containing the data of CH3 and CH4 is transmitted from the multiplexing / demultiplexing circuit 11 to the multimedia multiplexing / conversion device 2 on the receiving side through the line terminating circuit 13.

Next, FIG. 4 shows a multiplexing state (CH
It is an explanatory view in the case of accommodating disconnection of CH3 from the data accommodating state of 1, CH3, CH4), and accommodating CH4 instead. From the multiplexing state of FIG. 3 above, 9.6 kbi
t / s terminal data CH3 communication disconnection signal (RS / C
When the D / OFF signal) is detected by the multiplexer / demultiplexer circuit 11, a control signal for disconnection is given to the multiplexer / demultiplexer circuit 11.

As a result, the multiplexer / demultiplexer circuit 11 turns the state in which the bits of the slots S4 to S7 are set (on state) to the off state in order to invalidate it. As a result, the terminal data CH3 of 9.6 kbit / s is not accommodated in the slots BLK4 to BLK7, and at the same time, the communication bit data of the slot C causes the slots S4 to SK to be transmitted.
It is notified to the receiving-side multimedia multiplex conversion apparatus 2 that the transmission of CH3 data has been released by canceling 7 of the above.

Next, referring to FIG. 4, 19.2 kbit / s
Calling signal for terminal data CH5 (RS / CD ON signal)
Is detected by the calling / disconnection monitoring circuit 12, the calling / disconnection monitoring circuit 12 informs the multiplexing / demultiplexing circuit 11 of 19.2.
A control signal for accommodating the terminal data CH5 of kbit / s is given. By this control signal, the multiplexing / demultiplexing circuit 1
1 confirms whether or not there is an unused slot, and 19.
When it is determined that the terminal data CH5 of 2 kbit / s can be accommodated, the unused slots S4 to S7 and the slot S1 are used.
Bits 2 to S15 are set to declare the accommodation of CH5, and this declaration is notified to the receiving side multimedia multiplex conversion apparatus 2 by the bit data of slot C.

As a result, the terminal data CH5 of 19.2 kbit / s corresponds to the unused slot BL of the frame.
K4 to BLK7 (2.4 kbit / s × 4 = 9.6 kb
it / s) and unused slots BLK12 to BLK
It is accommodated at 15 (9.6 kbit / s).

Further, in FIG. 4, when a calling signal (SS / SR ON signal) of audio data CH2 of 32 kbit / s is detected by the calling / disconnection monitoring circuit 12, the calling / disconnection monitoring circuit 12 multiplexes. 32 kbit for the separation circuit 11
A control signal for accommodating / s voice data CH2 is given. Based on this control signal, the multiplexing / demultiplexing circuit 11 confirms whether or not there is an unused slot, and 32 kbit /
If it is determined that the voice data CH2 of s cannot be accommodated, the demultiplexing / demultiplexing circuit 11 notifies the calling / disconnection monitoring circuit 12 that the voice data CH2 cannot be accommodated. The call origination / disconnection monitoring circuit 12 which has received the notification that the accommodation is not possible responds to the telephone side of the channel CH2 with the notification that the accommodation is impossible.

However, when the above-mentioned 32 kbit / s voice data CH2 is to be accommodated in a multiplexed manner, in FIG. 4 above, the terminal data CH4 of 9.6 kbit / s is used.
If the accommodation of the terminal data CH5 of 19.2 kbit / s is released, the slots V3 to V7 are vacant, and therefore V3
From V7 to V7, for example, by occupying V3 to V6 as shown in FIG. 5, the audio data CH2 of 32 kbit / s can be multiplexed and accommodated. In this case, naturally, for example, the bits of slots SIG3 to SIG6 are set to declare that they are to be occupied, and this declaration is notified to the receiving side multimedia multiplex conversion apparatus 2 by the communication bit data of slot C.

The operation of multiplexing and accommodating will be described in detail with reference to FIGS. 3 to 5 above, and no matter which channel CH voice data or terminal data is given a call signal, the unused signal is not used in the frame. If the accommodation slot is unused and the data has a transmission capacity that can be accommodated, the data can be accommodated and transmitted in an empty slot. If the slot is in use and cannot be accommodated, the terminal side is notified that the accommodation is not possible. The operation has been described.

(Demultiplexing operation): Next, when the multiplexing / demultiplexing circuit 11 receives the multiplexed frame data,
Extract the communication bit data of slot C in the frame,
It is given to the calling / disconnection monitoring circuit 11. The calling / disconnection monitoring circuit 12 confirms the content of the extracted bit data and reads information such as a connection / disconnection command, a channel number, a data type, and a transmission rate.

(Structure of multiplexing / demultiplexing circuits 11 and 21):
FIG. 6 is a specific configuration diagram of an example of the multiplexing / demultiplexing circuits 11 and 21. In FIG. 6, the multiplexing / demultiplexing circuit 11
Is a microprocessor (MP) 31 and a program R
It is composed of an OM 32, a working RAM 33, and an interface circuit 34. With these configurations, a multiplexing process (MUX) and a demultiplexing process (DEMUX) are performed.

The program ROM 32 contains a program used by the microprocessor (MP) 31 for performing multiplexing and demultiplexing. The interface circuit 34 takes in data to be multiplexed from the interface circuits 14 to 18 of FIG. 1, provides demultiplexed data to the interface circuits 14 to 18, and exchanges various data with the calling / disconnection monitoring circuit 12. . Working RA
The M33 performs temporary storage of intermediate data when the microprocessor (MP) 31 uses the program of the program ROM 32 to perform the multiplex / separation processing, and data captured by the interface circuit 34.

The microprocessor (MP) 31 uses the program in the program ROM 32 and the control signals and data from the calling / disconnection monitoring circuit 12 to multiplex the input data and demultiplex the received multiplexed data. The interface circuit 34 and the calling / disconnection monitoring circuit 12
To give data to. With such a configuration of FIG. 6, the multiplexing / demultiplexing described in FIGS. 1 to 5 is performed.

(Construction of Call / Disconnection Monitoring Circuits 12 and 22): FIG. 7 is a specific configuration diagram of an example of the call / disconnection monitoring circuits 12 and 22. In this FIG.
The disconnection monitoring circuit 12 is an SV microprocessor (SVM
P) 41 and DA microprocessor (DAMP) 42
, Synchronization circuit (SYNC) 43, interface circuit 44, program ROM 45, and working RAM 4
6 is comprised.

The interface circuit 44 takes in a calling signal from the interface circuits 14 to 18 in FIG. 1, takes in a communication disconnection signal, and when the data cannot be accommodated, gives a notification signal indicating that the data cannot be accommodated to the interface circuits 14 to 18.
The synchronization circuit 43 detects / inserts the frame synchronization pattern of the multi-frame shown in FIG. The SV microprocessor 41 uses the program in the program ROM 45 to monitor and control various alarms in the device.

The DA microprocessor 42 monitors a calling signal, a disconnection signal, etc., communicates between CPUs between the opposite devices, and performs demand accommodating control to provide a high degree of flexibility in multiplexing (line allocation) and the like. , Demultiplexing, etc. are performed using the program in the program ROM 45.
The working RAM 46 is the SV microprocessor 41.
And the intermediate data in the middle of processing in the DA microprocessor 42, signals taken in by the interface circuit 44, etc. are temporarily held. FIG. 7
With the above configuration, the call origination / disconnection monitoring described with reference to FIGS.

(Communication bit data of slot C):
FIG. 8 is a specific explanatory diagram of an example of communication bit data of slot C generated in the calling / disconnection monitoring circuits 12 and 22. In FIG. 8, the communication bit data accommodated (assigned) in the slot C of the frame is mainly the connection instruction / disconnection instruction information C1, the channel number information C2 of the channel CH to be multiplexed, and the data to be multiplexed is a voice. It is composed of information C3 indicating whether it is data / terminal data, transmission rate information C4 of data to be multiplexed, data accommodation position (mapping) information C5, and the like. These communication bit data are accommodated and transmitted in the slot C of the multi-frame F1 to F4 as shown in FIG.

In the above description of the operation, an example of multiplexing in the multimedia multiplexing conversion apparatus 1 has been described.
Similar to the above, the same multiplexing can be performed in the multimedia multiplex conversion apparatus 2 by adopting the same configuration.

(Effects of the Embodiment) According to the above embodiments, the multimedia multiplexer / demultiplexers 1 and 2 monitor the calling / disconnection and occupy and release the data accommodating slot (data accommodating line). Therefore, even if the simple total capacity due to the total number of connected terminal devices exceeds the line capacity, it is possible to find and accommodate an unused data accommodation slot unless all terminal devices are used at the same time. If the capacity is large, a part or the whole of the data accommodating slot can be occupied to efficiently accommodate the data in a multiplexed manner.

Specifically, the unit for accommodating voice data (V1 to V8) is 8 kbit / s, and the unit for accommodating terminal data (BLK1 to BLK24) is 2.4 kbit / s. Therefore, desired voice data or terminal data can be freely accommodated in any vacant data accommodation slot.
Therefore, the data can be stored very efficiently, and the efficiency of the multiplexed transmission can be improved.

The bit data of slot C, the bit data of slots SIG1 to SIG7, and the slots S4 to S
By multiplexing transmission of 24 bit data or the like as the signal accommodating arrangement information, demultiplexing can be easily performed even if the data is not arranged in order from CH1 to CH45.

Further, when the communication disconnection request signal from the terminal device is detected, the communication disconnection information is accommodated in the frame, the signal accommodation arrangement information is updated and accommodated in the frame, and the communication disconnection request signal is output. The demultiplexing / demultiplexing circuits 11 and 21 for accommodating the input signal from the terminal device into the frame
Since it is canceled, the multimedia demultiplexing device 2 on the demultiplexing side can easily recognize the communication disconnection.

(Other Embodiments) (1) In the above embodiments, the multimedia multiplex converters 1 and 2 are
As an audio signal, for example, as an analog signal,
Internal voice coding (PCM, ADPCM, LD-CEL
64 kbit / s, 32 kbit / s
It is also preferable to adopt a configuration for generating audio data such as s, 16 kbit / s.

(2) It is also preferable to connect not only a telephone and a personal computer but also a facsimile machine, a modem, a PBX and the like as the terminal.

(3) Further, in FIG. 1 described above, the case where the multimedia multiplex converters 1 and 2 are connected by a high-speed digital dedicated line of 64 kbit / s has been described.
It is also possible to use a high-speed digital leased line of 8 kbit / s. Alternatively, an ISDN line such as NET64 can be used.

(4) Furthermore, it is also preferable to provide a backup line between the multimedia multiplex converters 1 and 2 and to provide a circuit for switching to the backup line when the high-speed digital dedicated line becomes abnormal.

(5) Further, in the above embodiment, the voice data is accommodated in units of 8 kbit / s, but by accommodating it more finely, for example, in 4 kbit / s, it is possible to reduce the vacant slot. The storage efficiency can also be improved. Similarly, the terminal data is stored in a unit of 2.4 kbit / s.
By setting t / s, the storage efficiency can be improved. Also, the accommodation unit may be changed significantly if necessary.

[0061]

As described above, according to the present invention, in the signal multiplexing device, the call request detecting means for detecting the call request signals from a plurality of devices, and the multiple busy area in the signal multiplex frame are multiplexed. Signal multiplexing frame management means for managing the unused area, signal accommodation layout information generating means for generating information indicating the state of the signal accommodation layout in the signal multiplexing frame, call request detection means, and signal multiplexing frame management Means for accommodating the input signal from the device which issued the call request signal in any of the multiplex unused areas in the signal multiplexing frame, and the signal accommodating arrangement information generated by the signal accommodating arrangement information generating means. And multiplexing means for accommodating and multiplexing the signals to form and outputting a signal multiplexing frame, and the signal demultiplexing device extracts the signal accommodation arrangement information from the signal multiplexing frame and extracts the extracted signal. The signal being accommodated from the accommodating arrangement information in the signal multiplexed in a frame is a structure comprising a demultiplexing means for demultiplexing output.

With such a structure, according to the present invention, it is not necessary to provide a large capacity transmission line in proportion to the number of input signals, as compared with the conventional simple time division multiplexing system, and a simple structure is provided. Thus, it is possible to realize a signal multiplexing / separating system, a signal multiplexer and a signal multiplexer / demultiplexer that can efficiently multiplex and transmit a plurality of input signals.

[Brief description of drawings]

FIG. 1 is a configuration diagram of a multimedia multiplex transmission system according to an embodiment of the present invention.

FIG. 2 is an explanatory diagram of a multiplexing method in the multiplexing / demultiplexing circuit according to the embodiment.

FIG. 3 is an explanatory diagram of specific multiplexing of channels CH1, 3, and 4 according to an embodiment.

FIG. 4 is a specific disconnection of the channel CH3 in the embodiment,
It is explanatory drawing of the multiplexing for accommodation of CH5.

FIG. 5 is a specific channel CH5 accommodation disconnection according to the embodiment;
It is explanatory drawing of the multiplexing for accommodation of CH2.

FIG. 6 is a specific configuration diagram of an example of the multiplexing / demultiplexing circuit according to the exemplary embodiment.

FIG. 7 is a specific configuration diagram of an example of a call origination / disconnection monitoring circuit according to the embodiment.

FIG. 8 is a specific explanatory diagram of an example of communication bit data of slot C generated in the calling / disconnection monitoring circuit of the embodiment.

[Explanation of symbols]

1, 2 ... Multimedia multiplexer, 11, 21 ... Multiplexing / separating circuit (MLDX), 12, 22 ... Call origination / disconnection monitoring circuit (SV), 13, 23 ... Line terminating circuit, 14-1
8, 24 to 28 ... Input / output interface circuit, 31 ... Microprocessor (MP), 32, 45 ... Program R
OM, 33, 46 ... Working RAM, 34, 44 ... Interface circuit, 41 ... SV microprocessor (S
VMP, 42 ... DA microprocessor (DAM
P), 43 ... Synchronous circuit (SYNC).

Claims (6)

[Claims] 1. A signal multiplexing device for accommodating input signals from a plurality of devices in a frame and multiplexing the signals to form a signal multiplexing frame, and receiving and demultiplexing the signal multiplexing frame from the signal multiplexing device. In the signal multiplexing / separating system including the signal multiplexing / demultiplexing device, the signal multiplexing device includes calling request detection means for detecting calling request signals from the plurality of devices, and multiplexing in the signal multiplexing frame. A signal multiplex frame managing means for managing a used area and a multiplex unused area, a signal accommodating arrangement information generating means for generating information indicating a state of a signal accommodating arrangement in the signal multiplex frame, and the call request detection Means and the signal multiplex frame management means, the input signal from the device which has issued the call request signal is transmitted to any one of the multiplex unused points in the signal multiplex frame. And a multiplexing means for accommodating in the middle area, accommodating and multiplexing the signal accommodating arrangement information generated by said signal accommodating arrangement information generating means, and forming and outputting said signal multiplexed frame, and said signal demultiplexing The apparatus is configured to include demultiplexing means for extracting signal accommodation arrangement information from the signal multiplex frame and demultiplexing and outputting a signal accommodated in the signal multiplex frame from the extracted signal accommodation arrangement information. Signal multiplexing / separation system. 2. The signal accommodating arrangement information generating means generates information on a signal accommodating position in the signal multiplex frame and information on signal specifications, and the information on the signal specifications comprises: 2. The signal multiplexing / separating system according to claim 1, which is a part or all of information on the number of signals accommodated in the signal multiplexing frame, signal type information, signal speed information and the like. 3. Further, a disconnection request detecting means for detecting a communication disconnection request signal from the plurality of devices is provided, and when the communication disconnection request signal from any of the plurality of devices is detected, communication disconnection information is output. Is accommodated in the signal multiplex frame, the signal accommodation arrangement information is updated to be accommodated in the signal multiplex frame, and the input signal from the device that has issued the communication disconnection request signal to the signal multiplex frame 3. The signal multiplexing / demultiplexing system according to claim 1, wherein the accommodation is released by the multiplexing means. 4. The multiplexer according to claim 1, wherein the multiplexing means is configured to take in a plurality of input signals having different signal rates, form a signal multiplex frame having a predetermined signal rate, and output the frame. The signal multiplexing / separating system according to any one of the above. 5. A signal multiplexing device for accommodating input signals from a plurality of devices in a frame and multiplexing the signals to form a signal multiplexing frame, wherein a call request for detecting a call request signal from the plurality of devices. Detecting means, signal multiplex frame managing means for managing multiple in-use areas and multiple unused areas in the signal multiplex frame, and signal accommodating for generating information indicating the state of signal accommodation arrangement in the signal multiplex frame By using the arrangement information generating means, the call origination request detecting means, and the signal multiplex frame managing means, an input signal from the device that has issued the call origination request signal is transmitted to any one of the signal multiplex frames within the signal multiplex frame. In addition to accommodating in the multiplexing unused area, accommodating and multiplexing the signal accommodating arrangement information generated by the signal accommodating arrangement information generating means, forming and outputting the signal multiplexing frame. Signal multiplexing apparatus characterized by comprising a multiplexing means for. 6. A signal demultiplexing for receiving a signal multiplexing frame in which a plurality of signals are accommodated in accordance with the signal accommodation arrangement information indicating the signal accommodation arrangement of the plurality of signals in the signal multiplexing frame. A device for extracting signal accommodation arrangement information from the signal multiplex frame,
A signal demultiplexing device comprising demultiplexing means for demultiplexing and outputting the signal accommodated in the signal multiplexing frame from the extracted signal accommodation arrangement information.